Please read this Windswept and Interesting report into Airborne Wind Energy.
It highlights a new approach, using evolutionary design software to design kite networks.
Kite networks are proving themselves.
Please join the effort to bring an open hardware energy solution. The more people who join, the faster the system evolves. The document is on version 4.3 now. Because of help and advice from Ben Lerner, Graham Brightwell and many others versions 4.4 and 5.0 will be out soon.